Rename the 'Attributes' class to 'Attribute'. It's going to represent a single attribute in the future.

llvm-svn: 170500
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index ff9039e..0c74149 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -1399,7 +1399,7 @@
       OS << ExceptionSpec;
     }
 
-    // FIXME: Attributes
+    // FIXME: Attribute
 
     // Print the trailing return type if it was specified in the source.
     if (Node->hasExplicitResultType())